Unlock Your Best Night’s Sleep with the Ultimate Sleep Cycle Calculator
Discover the perfect bedtime or wake-up time using our easy-to-use tool based on natural 90-minute sleep cycles. Wake up refreshed, alert and ready to go.
Calculadora de Sueño
Calcula los mejores horarios para despertar o dormir basados en ciclos naturales de sueño
Los ciclos de sueño duran aproximadamente 90 minutos. Despertarse entre ciclos te ayuda a sentirte más descansado. Añadimos 15 minutos para quedarte dormido.
Tus Horarios Recomendados
Basado en ciclos de sueño de 90 minutos
💡 La Ciencia del Sueño
- Un ciclo de sueño completo dura aproximadamente 90 minutos
- Cada ciclo incluye 5 etapas: sueño ligero, sueño profundo y REM
- Despertar al final de un ciclo te hace sentir más descansado que despertar a mitad del ciclo
- Se recomienda dormir de 4 a 6 ciclos completos (6 a 9 horas)
- Añadimos 15 minutos para que te quedes dormido
Temperatura Ideal
Mantén tu habitación entre 15-19°C para un sueño óptimo
Sin Pantallas
Evita dispositivos electrónicos 1 hora antes de dormir
Oscuridad Total
Usa cortinas opacas o un antifaz para bloquear toda la luz
Limita la Cafeína
Evita café y estimulantes al menos 6 horas antes de dormir
About Our Sleep Calculator
This free bedtime calculator is built to help you optimise your sleep schedule by aligning with your body’s natural rhythm. Rather than guessing when to go to bed or wake up, our tool uses proven average cycle lengths (around 90 minutes) and the latest research in sleep science and sleep hygiene.
Whether you are trying to stop waking up feeling groggy, plan a power nap, handle irregular work shifts or adjust for jet lag, our calculator has you covered.
We believe good sleep is not just about the number of hours, it’s about completing full sleep cycles, improving sleep quality, and waking during a light sleep stage so you feel refreshed.
How the Sleep Cycle Calculator Works
Your body progresses through stages each night: light sleep, deep (slow-wave) sleep, and REM sleep, composing one full sleep cycle of about 90 minutes. Waking up mid-cycle often leads to grogginess, reduced focus and sluggish performance for the day. Our process is simple:
Enter either the time you plan to wake up or the time you want to fall asleep.
We calculate the best matching times that let you complete 4 to 6 full sleep cycles (~6 to 9 hours) for optimal rest.
Use the suggestions to adjust your bedtime or wake-up time to maximise your sleep quality and reduce morning fatigue.
This tool is ideal for everyday sleepers, shift-workers, travellers and anyone seeking smarter sleep planning.
Why Timing Your Sleep Cycles Can Boost Your Health
Getting 7–9 hours of sleep is important, but when you wake during a deep sleep stage, you still feel tired.
By aligning your wake-up time with the end of a sleep cycle:
You wake from a light sleep stage, reducing grogginess and improving alertness
You support brain functions like memory, mood regulation and cognitive performance
You help your body complete its restorative tasks muscle repair, immune support, hormone balance
Starting with the right timing, you also promote better sleep hygiene, a stronger circadian rhythm, and more consistent sleep-wake patterns. Studies from leading sleep research foundations show that maintaining a regular sleep schedule helps regulate your internal body clock, also known as the circadian rhythm, allowing you to fall asleep faster and wake up more refreshed.
People who align their bedtime and wake-up times using a sleep cycle calculator experience noticeable improvements in energy levels, focus, and mental clarity. Consistent sleep patterns reduce the risk of chronic conditions such as heart disease, diabetes, and obesity, while enhancing mood and emotional stability.
Proper sleep timing also supports healthy melatonin production, helping you drift into deeper REM sleep and restorative deep sleep phases. These stages are critical for muscle recovery, memory consolidation, and overall sleep quality. When you maintain a balanced sleep-wake routine, your body synchronizes with its natural 90-minute sleep cycles, making it easier to wake up feeling alert and energized instead of groggy.
When to Use the Sleep Cycle Calculator
Regular Nights
If you know your wake-up time, use the calculator to find your ideal bedtime to complete full cycles.
Power Naps:
Use the tool to plan short naps (~20–30 minutes) or one full cycle (~90 minutes) so you wake refreshed, not groggy.
Shift Work & Irregular Schedules:
Enter your next wake time and let the calculator help you adapt your sleep plan accordingly.
Travel & Jet Lag:
When changing time zones or flipping your sleep schedule, use this calculator to reset your sleep rhythm and minimise fatigue.
What Our Users Say
Frequently Asked Questions
Start Your Journey to Better Sleep Today
Try the free Sleep Cycle Calculator now and discover your ideal bedtime or wake-up time. Plan smarter, sleep deeper, wake refreshed — every day.