Sudden Difficulty Waking

[u/itsbecauseshescrazy]

Has anyone experienced anything similar? I’m really struggling with what happened to me yesterday morning and I honestly haven’t felt safe in my body since.
My son is 4 months old and usually wakes before my 2-year-old daughter. Yesterday morning, I got up with him and brought him out to the living room, where I put him on his foam play mat with his Kick & Play piano. I lay down next to him and ended up falling asleep.
At some point, my son started crying, which woke my daughter up. She got out of bed and came looking for me but couldn’t find me. Both of my children were then crying/screaming and apparently in hysterics for around 5–10 minutes before I finally woke up.
What has really frightened me is that I have absolutely zero recollection of any of it. I didn’t hear my son crying, I didn’t hear my daughter get out of bed, and I have no memory of them crying or screaming beside me. I only know how long it went on because our security camera picked up the audio.
Normally I am VERY easy to wake, even when I’m in a deep sleep. If my kids cry, especially right next to me, I would normally wake almost immediately. That’s why this has really shaken me.
For context, I recently started taking 25 mg of sertraline. I hadn’t been drinking alcohol and I hadn’t taken anything else that night/morning that could have sedated me.
I did contact 13HEALTH afterwards and they advised me to see my GP rather than treating it as a medical emergency, but I’m still really scared because this was so completely out of character for me, however my gp says she has no idea what could have caused it cause i didn’t have any symptoms of a seizure or stroke.

Has anyone else experienced suddenly sleeping extremely deeply or being unusually difficult to wake, especially after starting sertraline? I’m not looking for anyone to diagnose me — I’d just really like to hear from people who have genuinely experienced something similar, because I feel really unsettled and alone after this.