diurnation
noun
di·ur·na·tion
| \ ˌdī(ˌ)ərˈnāshən\
plural -s
Definition of diurnation
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)
Keep scrolling for more