Your muse(s) are probably still talking to you, but you can't hear them because you're going on at great length about them not talking to you ;-)
Seriously, it becomes a self fulfilling prophecy if you worry about it too much.
Sometimes the muse takes a break, goes out to buy fish and chips, or have a quiet drink somewhere with the other muses who are also taking a break.
If you're real writer they'll come back, that's a promise, and they'll probably feel much better for the break.
Also, they get a bit pissed off with authors who are too clingy, who rely on them too much instead of digging into their own subconscious and stirring things up a bit for themselves.
But they rarely really leave you.
Ask your muse a question before you fall asleep, and they may well answer you in a dream.
Gyppo