I have been sent a query about core and optional sleep as there is some contradiction between what we said in the 1st and 2nd editions of the A2 Complete Companion. Looking around the other A2 textbooks, there seems to be a wide variety of explanations – most of which are not correct. Jim Horne proposed the concepts of core and optional sleep as a different perspective to the REM/non-REM distinction, which means that it is not possible to say the core sleep includes or doesn’t include REM sleep. Horne’s concept was that core sleep is essentially the first hours of sleep, and thus refers to mainly slow wave sleep (SWS) but includes some REM sleep. As the night progresses there is less SWS sleep and more REM sleep. Optional sleep is the sleep that occurs later in the night and which appears to be less crucial. This consists mainly of REM sleep but has some SWS/non-REM sleep. I hope that is clear! Thanks to Jo Haycock for pointing the inconsistency out to me.
A Level A Level Psychology assessment authors Back to school Ben Crystal book list book recommendations children's authors children's books children's dictionaries children's fiction classroom closing the word gap comprehension COVID-19 CPD critical thinking curriculum david crystal definitions Dictionaries dictionary Digital drama ed-tech Education english ethics exam preparation exams false friends GCSE guided reading history History teacher home learning independent reading Jill Carter knowledge questions KS1 KS2 KS3 language learning literacy Mastery mathematics maths maths education maths mastery media memory mental health methodology MFL MFL Teachers natural sciences non-fiction numicon Ofsted perspectives Phonics post-sats primary primary maths psychology reading reading for pleasure reading list Rebecca Priest remote learning revision Sam Holyman science secondary secondary education shakespeare Shakespeare400 shared knowledge student wellbeing teaching teaching ideas Teaching Strategies teaching tips technology TOK emotion TOK intuition TOK language TOK reason TOK sense perception transition truth Vocabulary vocabulary building wellbeing Word Gap words world book day writing