Previously, we found that a 1.5 hour afternoon nap could improve performance in sleep-deprived adolescents. Interestingly, we also found that this split sleep schedule benefits learning after a nap opportunity without impairing morning learning, despite less sleep the night before. While not replacing adequate nocturnal sleep, a split sleep schedule may be beneficial for chronically sleep restricted learners.
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In 2019, NFS5 aimed to uncover whether napping is still beneficial when participants are getting enough sleep overall, but apportioning the total amount of sleep between daytime naps and nocturnal sleep.
Staying vigilant during recurrent sleep restriction: dose-response effects of time-in-bed and benefits of daytime napping