From the moment I'm falling asleep, precisely after 1 hour I'm waking up with strong pain in my head from tumor. It takes about another hour to calm, and if I'm lucky, I can fall back asleep for another hour when the pain returns.
This is happening every day, every night, so I'm "snoozing" as often as I can. It feels like sleeping is triggering the pain, although is not true. There are days in which I can sleep 10 hours without interruptions.