diurnation
noun
di·ur·na·tion
ˌdī(ˌ)ərˈnāshən
plural -s
1
: the habit of sleeping or being quiescent by day
the diurnation of bats
2
: a daily recurrent fluctuation in an ecological community (as the vertical movement of plankton)
Word History
Etymology
Latin diurnus of the day, daily + English -ation (as in hibernation)