Are you sleepy when you are riding a bus or jeep?

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here in the Philippines most people are riding a public vehicle either jeep or bus. when I will be riding a bus or jeep, I always fall asleep. I don't know why it is really nice to sleep when the vehicle starts to move. It seems like I am swinging and I started to nod... did you experience this too. Maybe even those people who are riding in their private vehicle I;m sure they are sleepy when riding too. Do you have same experience? please share. To me, there was even one time that I was not able to stop in my destination because I am sleeping when the bus arrived there. Please share yours.