Not neglect from what was described and wouldn't meet the threshold for intervention but not an example of stellar parenting.
Don't all parents display less than stellar parenting at times?
Can't we collectively agree that we all are less than perfect parents? At times don't all parents make mistakes?
Also, can I rephrase the OP's situation differently (as I don't know her this is just a possibility):
She got drunk (not perfect but human). She knew she would not be capable of keeping kids safe all day feeling sub human. She took a nap - calculating the risk of harm to her children in the hour she was asleep against the risk of harm to children through their sole carer being exhausted all day?
I say this because I made the same decision as OP, I recently left my 2 y/o downstairs watching telly while I had a nap. This was for mental health not hangover reasons but I calculated that I was no good to him at the level of exhaustion I was at. I have insomnia, depression, and am autistic so not the best at seeing what's in front of me even when fully rested let alone after very little sleep.
I think my decision was in the best interests of my child, emotionally and physically. It's distressing to read people describe such a decision as neglect. (As happened towards beginning of the thread.) I don't have anybody nearby who can watch my child, ie a grandparent, btw.