1st night without diapers

My son has been day time potty trained for a while now (he's 3yrs old) however at night I would put a diaper on him while he was sleeping just in case. Well last night I bought a sheet protecter and did not put a diaper on and no accident Now he did wake up at around 2am to go pee but hey better in the toilet then in his bed. I guess the time has finally come that I now only have to by diapers for 1