Does he have food available later in the night? I think you might see a cycle similar to yesterday morning where he keeps dropping till the end of the cycle.
If possible, I would set an alarm for later - say +6 or so to feed him if you don't have an autofeeder.
@Bandit's Mom I don't have an autofeeder, I can set an alarm though. Should I check again before bed too? If I leave out food for him it always possible his sister might eat it so I will set an alarm to get up again. If I get up at +6 should I also get up later in the cycle as well to check? Like+8 or +10?