Do you wake up at the same time every night? It's nothing to worry about, but if you want to fall back asleep, don't check the time
'Strange Nights' (6/7). Everyone wakes up several times a night, most often at the end of a sleep cycle. Good sleepers don't remember it, while others struggle to drift back to sleep. To understand this scenario, let's look at how sleep cycles work.
We haven't written up this one. Le Monde English has the full story — the link below goes straight to it.