Athletic IQ kit is made to order. Deadlines: 1st and 15th of each month. We aim to deliver within 2 weeks, subject to availability. Contact us if there is a delay. UK delivery is free. Fulfilled by Peter Spivey Ltd. Dismiss
- Circadian rhythm — internal body clock controlling sleep-wake patterns.
- Melatonin — hormone that helps signal sleepiness.
- Non-REM / REM sleep — broad sleep stages with different roles.
