What does that mean exactly? Listening to the song Весенее танго by Sergey and Tatyana Nikitin(a)

Приходит время, с юга птицы прилетают
Снеговые горы тают и не до сна

Wondering if it's a colloquial phrase meaning "not completely," but I find it odd that сон would be here.

Another question regarding a later stanza:

Сколько сердце валидолом не лечи
Всё равно сплошные перебои
Сколько головой об стенку не стучи
Не помогут лучшие врачи

I'm assuming a good translation would be:

No matter how much you treat a heart with validol
You'll still have complete stoppage (<- not the prettiest word choice here, but...)
No matter how much you hit you head on a wall
The best doctors won't/can't help

So the construction "Сколько ... не + imp." means "No matter how much...," correct? Wondering how common this is used in speech as opposed to what I've heard before, something like "Да не важно, сколько ..., все таки не поможет!" Thoughts?

https://learn-russian.livejournal.com/1068873.html