CalclyHub
Sleep Calculators
Plan better sleep with calculators for sleep cycles, wake-up timing, and CBT-I-based sleep restriction windows. These tools provide educational estimates and should not replace medical advice.
Sleep tools use local date and time formatting for France. Sleep-cycle timing and CBT-I sleep-window calculations use the same evidence-based assumptions across countries.
Choose your sleep goal
Sleep calculators
Sleep Calculator
Find the best time to wake up or go to bed using sleep cycle science.
Sleep Restriction Therapy Calculator
Calculate your sleep window using sleep restriction therapy (SRT) and CBT-I principles.
Sources and methodology
Sleep-cycle timing is based on average adult sleep cycle duration. Sleep restriction therapy estimates follow CBT-I sleep-window principles and conservative safety floors. References include the American Academy of Sleep Medicine, CDC sleep guidance, and NIH NHLBI sleep health resources.
These calculators provide educational estimates only. If you have persistent insomnia, severe daytime sleepiness, untreated sleep apnea, bipolar disorder, seizure risk, or safety-critical work, consult a qualified clinician before changing your sleep schedule.