So there's no specific way to set daytime/nighttime length, but there are a few commands you can use in vanilla to make things more comfortable for you.
Press t and type /time hoursperday [number] will change the total number of hours in a day. So instead of 24 it can be anything really. You'll still get shifting day/night cycle depending on your time of year but it will give you more to play with. It'll make those beds come a lot more in useful.
And then there's /time speed [number] (default 60), which sets how fast those hours pass. So the default length of a full day is like 45 minutes I think. So if you take that down to /time speed 46 I believe you get an hour IRL per in-game day. Again, won't change the day/cycle itself but it will give you more time to get stuff done. Then you can sleep through the night. I have historically done a lot of 1 hour IRL days, and they give you a nice extra buffer to play with, especially in the early game.
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EnbyKaiju's post in is there a way to make daytime longer? was marked as the answer