Sleep Apnea Treatment

Two or three hours after I’ve fallen asleep, my boyfriend sometimes calls me on my cell phone, which I place right near my bed. According to my call log, I usually talk to him for 2 or 3 minutes (general, coherent sentences so he says), but when I wake up the next day, I have absolutely no recollection of speaking to him or of the phone ringing at all. This concerns me because I would like to be in control of my actions always, and this is a recurring thing (almost every time he calls at night). Please help! Thanks.