My mam wont stop snoring?

Shes always been a really loud snorer, my dad has to take sleeping tablets or go to the pub and get drunk in order to sleep at night, im in the next room and I can just hear this constant loud growl, I have to sleep during the day because of it. Its so bad, she knows how bad it is but she wont do anything, sometimes I cant even hear the tv with her. Its driving me insane. I close her door every night to try and block out the sound but it makes no difference. Is there anything I can do? she just gets angry if you talk to her about it but its not fair on everyone else in the house. Sometimes she sounds like a cow being tortured and some times she sound like a motorbike.