Doctor Dolittle in the Moon by Hugh Lofting

That night was, I think, the most disturbed one that we spent in the whole course of our stay on the Moon. Not one of us slept soundly or continuously. For one thing, our growth had proceeded at an alarming and prodigious rate; and what bedding we had (we slept in that mild climate with the blankets under us instead of over us) had become absurdly short and insufficient for our new figures. Knees and elbows spilled over the sides and got dreadfully sore on the hard earth. But besides that discomfort, we were again conscious throughout the whole night of mysterious noises and presences. Every one of us seemed to be uneasy in his mind. I remember waking up one time and hearing the Doctor, Chee-Chee and Polynesia all talking in their sleep at the same time.

Hollow-eyed and unrested we finally, at daybreak, crawled out of our various roosts and turned silently to the business of getting breakfast. That veteran campaigner Polynesia was the first to pull herself together. She came back from examining the ground about the camp with a very serious look on her old face.