At night, my boyfriend won't text me for about 6 hours and then send me a "passed out just woke" text. He does this a couple times a month. Why?

Why won't he just text me beforehand and tell me he's gonna be MIA? One time I calles him on the phone because he didn't text the whole night after work and I found out his roommate threw a house party which he involuntarily attended. Is he being inconsiderate?
At night, my boyfriend won't text me for about 6 hours and then send me a "passed out just woke" text. He does this a couple times a month. Why?
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