<human>: Can you condense the text into three sentences or less?

BF and I have been dating almost a year, exclusive for 9 months. We get along great, except I always have this strange feeling something is not "right."

We use a 3rd party messaging app to text and recently at random times ( I'm talking 5 pm, 7 pm, 9 or 6) we will be texting and he'll disappear for hours and text me maybe 1 or 2 AM with, "sorry I fell asleep."

This has happened at least 5-7 x in the past two weeks when it had never happened before in our relationship. I have never known him to take naps, especially during the day.

Am I paranoid to think something else might be up? I just feel really weird about the whole thing and I don't want to come off poorly. But its starting to get me thinking, why this would continuously happen where he wouldn't be available for hours with no excuse. Please help me.
<bot>: BF keeps claiming he falls asleep whenever he misses my texts, but it happens so frequently (when it previously never did) and makes me wonder...