"Fragmented sleep" means having sleep that is interrupted or broken into small parts instead of sleeping through the night in a continuous stretch. Full definition
It is quite unfortunate when your little one force you to be up all the hours of the night and repeated cycles of fragmented sleep. (toptenstrollers.com)
With fragmented sleep, postpartum is hard enough as it is! (megangarcia.com)
The best way to manage fragmented sleep is to change your own way of thinking about it. (milkontap.com)