Best Sleep Cycle Calculator to Improve Your Sleep Quality

Do you often wake up feeling groggy, even after a full night’s sleep? Struggle to fall asleep at the right time? You’re not alone. Many people toss and turn at night, only to wake up groggy and drained. But what if you could wake up feeling refreshed every morning? That’s where our Smart Sleep Cycle Calculator comes in!

`; } // Display wake-up time results function displayWakeUpTimeResults(times, bedTime) { const bedTimeFormatted = formatTimeFromString(bedTime); resultsDiv.innerHTML = `

Wake-up Recommendations

If you go to bed at ${bedTimeFormatted}, try waking up at one of these times:

These times allow for 5 or 6 full sleep cycles (7.5-9 hours), helping you wake up refreshed.

`; } // Format time string to AM/PM function formatTimeFromString(timeStr) { const [hours, minutes] = timeStr.split(':').map(Number); const ampm = hours >= 12 ? 'PM' : 'AM'; const hours12 = hours % 12 || 12; const minutesStr = minutes < 10 ? '0' + minutes : minutes; return `${hours12}:${minutesStr} ${ampm}`; } // Calculate sleep debt function calculateSleepDebt() { const targetSleep = parseFloat(document.getElementById('targetSleep').value); const days = [ parseFloat(document.getElementById('day1').value) || 0, parseFloat(document.getElementById('day2').value) || 0, parseFloat(document.getElementById('day3').value) || 0, parseFloat(document.getElementById('day4').value) || 0, parseFloat(document.getElementById('day5').value) || 0, parseFloat(document.getElementById('day6').value) || 0, parseFloat(document.getElementById('day7').value) || 0 ]; const targetWeekly = targetSleep * 7; const actualWeekly = days.reduce((sum, day) => sum + day, 0); const sleepDebt = targetWeekly - actualWeekly; displaySleepDebtResults(targetWeekly, actualWeekly, sleepDebt); } // Display sleep debt results function displaySleepDebtResults(targetWeekly, actualWeekly, sleepDebt) { let debtLevel = ''; let debtClass = ''; let recommendation = ''; if (sleepDebt <= 0) { debtLevel = 'No Sleep Debt'; debtClass = 'mild'; recommendation = 'Great job! You\'re meeting your sleep goals. Keep it up!'; } else if (sleepDebt > 0 && sleepDebt <= 5) { debtLevel = 'Mild Sleep Deprivation'; debtClass = 'mild'; recommendation = 'Try to get a bit more sleep. A 30-minute earlier bedtime can help.'; } else if (sleepDebt > 5 && sleepDebt <= 10) { debtLevel = 'Moderate Sleep Deprivation'; debtClass = 'moderate'; recommendation = 'Aim for an extra hour of sleep per night. Consider adjusting your schedule.'; } else { debtLevel = 'Severe Sleep Deprivation'; debtClass = 'severe'; recommendation = 'Prioritize sleep. Try sleeping 1-2 hours more per night and maintain a consistent schedule.'; } resultsDiv.innerHTML = `

Sleep Debt Analysis

Target Sleep Per Week: ${targetWeekly.toFixed(1)} hours

Actual Sleep Per Week: ${actualWeekly.toFixed(1)} hours

Sleep Debt: ${sleepDebt.toFixed(1)} hours

${debtLevel}

Recommendation: ${recommendation}

`; } // Reset the calculator function resetCalculator() { document.getElementById('wakeUpTime').value = '06:30'; document.getElementById('bedTime').value = '22:00'; document.getElementById('targetSleep').value = '7.5'; for (let i = 1; i <= 7; i++) { document.getElementById(`day${i}`).value = ''; } resultsDiv.style.display = 'none'; document.querySelector('input[name="calcType"][value="sleepTime"]').checked = true; toggleInputSections(); } });