Sleep Needs Calculator

Sleep is part of training

Adaptation happens during sleep: repair, hormones, motor learning. Training a lot while sleeping little means working against yourself.

The calculator estimates your need from age and weekly training volume. Training more means needing more — the key difference from general advice.

How it is calculated

Sleep need = base + training bonus. Base: 8 h, under 18 years 9 h, over 65 years 7.5 h. Bonus: from 6 training hours a week +0.5 h, from 10 h +0.75 h, from 15 h +1 h. Deficit = need − actual sleep.

The bonus follows studies of athletes in which higher training volume went with longer deep sleep and more growth hormone — a large share of recovery happens while you sleep.

Example: 28 years old, 10 training hours a week, sleeping 7 h. Need = 8 + 0.75 = 8.75 h. Deficit = 8.75 − 7 = 1.75 h per night.

The rating: up to 0.5 h deficit slight, up to 1 h noticeable, beyond that significant — the example sits firmly in the last band.

To calculate your sleep need honestly, measure actual sleep with your watch over a week rather than guessing: time in bed is not time asleep.

What helps more than the hour count

Regular timing. Going to bed and getting up at the same time often does more than an extra half hour.

And a twenty-minute nap does not replace a night, but noticeably helps during hard training blocks.

Frequently asked questions

Can I catch up on sleep at the weekend?

Partly. Some recovery can be caught up; the missed adaptation to training cannot fully.

Why do I sleep worse after hard sessions?

Late intense efforts keep heart rate and body temperature elevated. Training hard in the evening means needing longer to wind down.

How much sleep do teenagers need?

Considerably more than adults, usually eight to ten hours — towards the upper end with heavy training.