Sleep science categorizes chronotype into five types: extreme morning type, morning type, neutral, evening type, and extreme evening type.

“in sleep science we break it down not into three categories but five extreme morning type morning type a neutral evening type extreme evening type”

“the final aspect of the qqr quantity quality regularity comes on to timing how is timing different to regularity because regularity is about getting your sleep at the same correct time what I mean by timing is your chronotype so people may have heard of this phrase are you a morning type evening type or somewhere in between that”

“sleep science has then gone a little bit further we split it into five categories sometimes which is extreme morning types morning”