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. 2020 Dec 12;44(6):zsaa277. doi: 10.1093/sleep/zsaa277

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© Sleep Research Society 2020. Published by Oxford University Press on behalf of the Sleep Research Society.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Memory task protocols. All encoding sessions were performed at 16:45 pm, approximately 75 min after the nap period (14:00–15:30 pm). In the Four Mountains Task (4MT), encoding was immediately followed by retrieval. For the picture encoding task, the retrieval session was performed after two nights of 9 h nocturnal time in bed (TIB). Encoding sessions for the factual knowledge task took place across 3 days, with encoding of material occurring after the nap period. The retrieval session took place in the evening (20:30 pm) of the next rest day. Asterisks indicate the naps in which sleep was assessed with polysomnography.