Relative humidity goes higher at night
@arapaho415, so it is a good time for the succulents to really take in all the moisture in the air as their stomates are open at night as well. So if there is moisture in the air, the plant will not lose soil moisture quickly.
So that is another thing with night time watering for them..too wet soil, and increased humidity at night, it may not kill them out right, but it will affect them sooner or later, leaves go lanky, aside from inviting more potential for fungal and bacterial issues. Too warm and moist conditions will accelarate production of fungal spores and bacterial production. It would be nice if it is really breezy, it will not stay muggy.
