deprivation

Microsleeps are unpredictable periods of sleep that last for only a few seconds and are triggered by sleep deprivation.

He had to make his peace with deprivation and to doubt the sincerity of anyone who would wish to treat him well (not coincidentally, he might previously have gone out with a number of women who were unavailable or offhand.

Had we ever been too conspicuously happy, we might have upset a parent who was battling a sense of despair or resignation and was furious at the deprivations they once had to endure.