Great question — answering as the UphillTech team:
No mesh or tent window is going to be really clear enough, and a retractable section of fly sheet would probably require getting out of bed to retract it, rather defeating the object. A tent with a small porch, sleeping with your head to the door, would allow you to see a lot of sky while lying down, and you wouldn't have to get right up to zip it shut. Better still if the top of the porch is almost above your face. I have the original 90s VauDe Hogan (link is to a review of a current model, which gives a good idea of the shape) and pitched in the right orientation that would be ok, i.e. with the door downwind and uphill, and in this case facing away from light sources. My tarp-over-bike...
Full answer by Chris H: https://outdoors.stackexchange.com/a/30367 (CC BY-SA 4.0).
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