There are indications that missing 15 minutes of sleep can throw you off. https://www.dailystar.co.uk/real-life/774372/sleep-insomnia-how-much-cant-sleep-tired

There are indications that missing 15 minutes of sleep can throw you off. https://www.dailystar.co.uk/real-life/774372/sleep-insomnia-how-much-cant-sleep-tired-better-nights-sleep https://www.dailystar.co.uk/real-life/774372/sleep-insomnia-...