https://www.smithsonianmag.com/science-nature/you-cant-sleep-while-traveling-because-your-brain-acts-dolphins-180958860/
Basically, when traveling, only half of your brain is asleep. The other half stays alert to any changes etc so that you may be able to respond to anything it views as a threat.
But in a car (instead of in a house) your body also experiences a constant movement (part of highway hypnosis) that makes you sleepy. So it’s easier to fall asleep but your mind still wants to remain partially alert in case of danger.
Your results may vary. I am not a doctor. I cannot answer more in depth questions about why this may or may not be the case for you.
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