Why do we tend to sleep whie travelling?

Question

Why do we tend to sleep whie travelling?

Answer 1

Nothing else to do, relieve stress, sleep off a good buzz, lots of reasons depends on the person.

Tired, that works for me.

Answer 2

Because we are relaxing if it is in anticipation of a vacation destination or the return trip.

If it is while commuting to work, it can be attributed to the familiarity of the scenery which we are used to passing everyday.  If it is a late night commute, we become hypnotized by the monotony of the road.

Answer 3

It makes the time seem to go faster.

Answer 4

Your simply tired.