Primary insomnia is defined as difficulties in falling asleep, maintaining sleep or non-
restorative sleep accompanied by significantly impaired daytime functioning in the absence …

Many attempts have been made to localize the physical trace of a memory, or engram, in the
brain. However, until recently, engrams have remained largely elusive. In this Review, we …

Sleep facilitates memory consolidation. A widely held model assumes that this is because
newly encoded memories undergo covert reactivation during sleep. We cued new memories …

Insight denotes a mental restructuring that leads to a sudden gain of explicit knowledge
allowing qualitatively changed behaviour,. Anecdotal reports on scientific discovery suggest …