Congratz, I'm really happy for you! I hope the experience you had boosts your LDing even more!

Using electronics can be a real distraction and your success might have came from your minimization of it.

I also remember reading that doing activities that require mental effort like solving puzzles ( or in your case playing an instrument ) increases the amount of REM you have or something like that (ETWOLD). Not 100% sure about that one though, but it sounds reasonable, because your brain is building stronger neural pathways for the skill ~ you're learning = more subconscious activity ( ? ).