{"id":1708,"date":"2024-12-25T04:59:41","date_gmt":"2024-12-25T04:59:41","guid":{"rendered":"https:\/\/donhit.com\/en\/?p=1708"},"modified":"2025-02-07T09:15:03","modified_gmt":"2025-02-07T09:15:03","slug":"sleep-cycle","status":"publish","type":"post","link":"https:\/\/donhit.com\/en\/calculator\/sleep-cycle\/","title":{"rendered":"Sleep Cycle Calculator"},"content":{"rendered":"<p><center><div class=\"container123\">\r\n        <h2>Sleep Cycle Calculator<\/h2>\r\n        \r\n        <div class=\"input-section\">\r\n            <div class=\"input-group\">\r\n                <label for=\"wakeTime\">I want to wake up at:<\/label>\r\n                <div class=\"time-input-wrapper\">\r\n                    <div class=\"time-inputs\">\r\n                        <select id=\"hour\" onchange=\"updateTime()\">\r\n                            <option value=\"12\">12<\/option>\r\n                            <option value=\"1\">1<\/option>\r\n                            <option value=\"2\">2<\/option>\r\n                            <option value=\"3\">3<\/option>\r\n                            <option value=\"4\">4<\/option>\r\n                            <option value=\"5\">5<\/option>\r\n                            <option value=\"6\">6<\/option>\r\n                            <option value=\"7\">7<\/option>\r\n                            <option value=\"8\">8<\/option>\r\n                            <option value=\"9\">9<\/option>\r\n                            <option value=\"10\">10<\/option>\r\n                            <option value=\"11\">11<\/option>\r\n                        <\/select>\r\n                        <span>:<\/span>\r\n                        <select id=\"minute\" onchange=\"updateTime()\">\r\n                            <option value=\"00\">00<\/option>\r\n                            <option value=\"15\">15<\/option>\r\n                            <option value=\"30\">30<\/option>\r\n                            <option value=\"45\">45<\/option>\r\n                        <\/select>\r\n                    <\/div>\r\n                    <select id=\"period\" class=\"period-select\" onchange=\"updateTime()\">\r\n                        <option value=\"AM\">AM<\/option>\r\n                        <option value=\"PM\">PM<\/option>\r\n                    <\/select>\r\n                <\/div>\r\n            <\/div>\r\n\r\n            <div class=\"button-group\">\r\n                <button class=\"calculate-btn\" onclick=\"calculateSleepTimes()\">Calculate Sleep Times<\/button>\r\n                <button class=\"reset-btn\" onclick=\"resetCalculator()\">Reset<\/button>\r\n            <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"results\" id=\"results\">\r\n            <h2>Recommended Bedtimes<\/h2>\r\n            <p class=\"info-text\">For optimal rest, try falling asleep at one of these times:<\/p>\r\n            <div class=\"time-suggestions\" id=\"timeSuggestions\"><\/div>\r\n            <p class=\"info-text\">\r\n                These times are based on the average 90-minute sleep cycle. You should also account for roughly 15 minutes to fall asleep.\r\n            <\/p>\r\n        <\/div>\r\n    <\/div>\r\n\r\n    <script>\r\n        function padNumber(num) {\r\n            return num.toString().padStart(2, '0');\r\n        }\r\n\r\n        function convert12To24(hour, minute, period) {\r\n            hour = parseInt(hour);\r\n            if (period === \"PM\" && hour !== 12) {\r\n                hour += 12;\r\n            } else if (period === \"AM\" && hour === 12) {\r\n                hour = 0;\r\n            }\r\n            return `${padNumber(hour)}:${minute}`;\r\n        }\r\n\r\n        function convert24To12(timeStr) {\r\n            const [hours, minutes] = timeStr.split(':').map(Number);\r\n            let period = \"AM\";\r\n            let hour = hours;\r\n\r\n            if (hours >= 12) {\r\n                period = \"PM\";\r\n                if (hours > 12) {\r\n                    hour = hours - 12;\r\n                }\r\n            }\r\n            if (hours === 0) {\r\n                hour = 12;\r\n            }\r\n\r\n            return {\r\n                hour: hour.toString(),\r\n                minute: padNumber(minutes),\r\n                period: period\r\n            };\r\n        }\r\n\r\n        function updateTime() {\r\n            const hour = document.getElementById('hour').value;\r\n            const minute = document.getElementById('minute').value;\r\n            const period = document.getElementById('period').value;\r\n            calculateSleepTimes();\r\n        }\r\n\r\n        function calculateSleepTimes() {\r\n            const hour = document.getElementById('hour').value;\r\n            const minute = document.getElementById('minute').value;\r\n            const period = document.getElementById('period').value;\r\n            \r\n            const time24 = convert12To24(hour, minute, period);\r\n            const wakeDateTime = new Date(`2024-01-01T${time24}`);\r\n            const suggestions = [];\r\n\r\n            \/\/ Calculate 6 sleep cycles (9 hours) to 4 sleep cycles (6 hours)\r\n            for (let cycles = 6; cycles >= 4; cycles--) {\r\n                const sleepTime = new Date(wakeDateTime);\r\n                \/\/ Subtract sleep cycles (90 mins each) plus 15 mins to fall asleep\r\n                sleepTime.setMinutes(sleepTime.getMinutes() - (cycles * 90 + 15));\r\n                \r\n                const timeStr = sleepTime.toLocaleTimeString('en-US', {\r\n                    hour: 'numeric',\r\n                    minute: '2-digit',\r\n                    hour12: true\r\n                });\r\n                \r\n                suggestions.push({\r\n                    time: timeStr,\r\n                    cycles: cycles\r\n                });\r\n            }\r\n\r\n            displaySuggestions(suggestions);\r\n        }\r\n\r\n        function displaySuggestions(suggestions) {\r\n            const container = document.getElementById('timeSuggestions');\r\n            container.innerHTML = '';\r\n\r\n            suggestions.forEach(suggestion => {\r\n                const chip = document.createElement('div');\r\n                chip.className = 'time-chip';\r\n                chip.textContent = `${suggestion.time} (${suggestion.cycles} cycles)`;\r\n                container.appendChild(chip);\r\n            });\r\n\r\n            document.getElementById('results').style.display = 'block';\r\n        }\r\n\r\n        function resetCalculator() {\r\n            const now = new Date();\r\n            const time12 = convert24To12(\r\n                now.toLocaleTimeString('en-US', {\r\n                    hour: '2-digit',\r\n                    minute: '2-digit',\r\n                    hour12: false\r\n                })\r\n            );\r\n\r\n            document.getElementById('hour').value = time12.hour;\r\n            document.getElementById('minute').value = time12.minute;\r\n            document.getElementById('period').value = time12.period;\r\n            document.getElementById('timeSuggestions').innerHTML = '';\r\n        }\r\n\r\n        \/\/ Initialize\r\n        document.addEventListener('DOMContentLoaded', () => {\r\n            resetCalculator();\r\n            calculateSleepTimes();\r\n        });\r\n    <\/script><\/center>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[184],"tags":[],"class_list":["post-1708","post","type-post","status-publish","format-standard","hentry","category-calculator"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - 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