My Boyfriend (together For 6 Years) Used To Wake Up

My boyfriend (together for 6 years) used to wake up during the night out of nowhere and started to have intercourse with me. Although, during lockdown, unfortunately he stopped this, even the number of sex has reduced. He went back to work 1,5 week ago and few days ago he again started the middle of night “thing”.
I would like to know your honest opinion. Does this mean that someone at work makes him feel more horny as I haven’t changed on my behaviour.

Thank you very much,
Ace