what makes a person sleeping in a boat get up early in the morning ?

The fresh morning air seems to put people more in touch with the natural rhythms of life. The morning is so full of life that one cannot help but to get up.

It is surprising how early one can get up, when camping out. One does not yearn for “just another five minutes” nearly so much, lying wrapped up in a rug on the boards of a boat, with a Gladstone bag for a pillow, as one does in a featherbed. We had finished breakfast, and were through Clifton Lock by half-past eight. ch 18