So...sleep learning actually works (Patreon)
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"One of the more recent and well-known research papers written on this topic was published in the journal Cerebral Cortex by the Swiss National Science Foundation where the researchers tried to find out if they could use NonREM sleep to increase the chances of someone remembering words from a foreign language.
They took two groups of people, all native German speakers, and gave them some Dutch words with the German translations. They were told to learn the words at 10pm but one group was kept awake, while the other made to sleep. Both groups then listened to audio that contained the words, and others, that they learnt earlier for the next few hours.
Both groups where then awoken at 2 am and given a test to see how many of the dutch words they had learnt.
The researchers found that the group that listened to the words during NonREM sleep did a lot better at recalling the words that they’d heard at 10pm."
[Is it Possible to Learn a Language While You Sleep? | BritVsJapan]