Andrew Huberman· PhD
So if you're sleep deprived, even by an hour or so, you're going to get far less rapid eye movement sleep because rapid eye movement sleep is what occurs toward the end of a sleep night. During the early part of the night, far more slow wave sleep. In getting less rapid eye movement sleep, we know it makes you more emotionally labile, but now we know it's also going to alter certain forms of glucose metabolism during the night and during wakefulness.