Getting quality sleep is not just about how many hours you spend in bed—it’s about when you sleep and wake up. That’s why we’ve created the HypePillow Sleep Calculator, a simple tool to help you find the best bedtime and wake-up cycles according to your body’s natural rhythm. With this sleep calculator, you can easily discover the right sleep patterns to wake up refreshed, reduce neck pain, and start your day with more energy.

Your sleep is made up of 90-minute cycles
Instead of thinking “8 hours is enough,” science says we should complete full sleep cycles.
One cycle = light sleep → deep sleep → REM (dreaming).

Waking up during a cycle? You feel tired.
Waking up in the middle of a cycle (like deep sleep) can make you feel groggy and lazy
— even after 8+ hours of sleep.

Waking up at the end of a cycle? You feel fresh.
Our calculator helps you plan bedtimes that match your sleep cycles, so you wake up at the right time — full of energy.

Each cycle lasts about 90 minutes. A healthy adult completes 4 to 6 cycles per night.
Here’s how it works:

0 – 10 mins: Stage N1 (Light Sleep)

• You’re just drifting off — a half-awake, half-asleep state.

• Breathing slows, muscles relax

10 – 25 mins: Stage N2 (Deeper Light Sleep)

• Body temperature drops, and heart rate slows.

• Brain starts blocking out external sounds.

• Makes up about 50% of your total night’s sleep.

25 – 45 mins: Stage N3 (Deep Sleep)

• This is where your body heals and recovers.

• Growth hormone is released, and immune function strengthens.

• It’s hardest to wake up during this phase.

• Most important for physical restoration.

45 – 90 mins: REM Sleep (Dreaming Stage)

• Rapid Eye Movement (REM) begins.

• Brain becomes active — dreams happen here.

• Memory consolidation and emotional processing occur.

• Muscles are temporarily “paralyzed” to prevent acting out dreams.

Sleeping 4 cycles (6 hours) is okay sometimes — but try to aim for 5 or 6 for better health.