"To everything there is a season and a time to every purpose under heaven" - and I know I probably didn't get the quote quite right, but it is the thought that counts. And as impossible as it may seem, there are times that are not right for musicalizing.
Whenever I don't get a chance to play for a while I remember something that Mason Williams wrote and I stumbled across many years ago. He said that his guitar playing had gotten better because he had been working on his "self". He said "it's a cheap trick, but it works."
Undoubtedly, there is a certain fall off in technique when you don't practice every day. I think it was John McLaughlin who said that if he doesn't practice for one day he notices it, if he doesn't practice for two days other guitarists notice it, and if he doesn't practice for three days everyone notices it. Fortunately, there is so much more to making music than simply technique. I often find that improving your understanding of a song often happens when you can't "play" it. Thinking my way through a song or an arrangement is often much more effective than trying things out with an instrument in my hand. Sometimes, if I think long and hard enough about a song, once I pick up a guitar and actually play it the song flows out like water. It's like Mooh said, practice in your head. It is a cheap trick, and it does work.

Bartholomew (butchering the quotes right and left)