"During the night, I rest."
Translation:Durant la nuit, je me repose.
This is very tricky, but it cannot work here. « lors » does mean “during”, but only during specific events that are clearly known or described, you can't use it with a generic «nuit», it has to be a specific night. You could say « lors de ma nuit de noces » “on my wedding night”, or « lors de ces nuits magnifiques » “during these beautiful nights” (imagine you're describing nights spent in Alaska, watching polar lights).
you are not supposed to adapt sentences so that they fit with the words you already know ;-) this sentence is meant to teach you that "rest" translates in "se reposer" with is a pronominal verb (reflexive).
by the way, the correct form of your proposal is :"pendant la nuit, je dors."
Ah, I understand what you're saying :) Thanks! By the way, my family is Mauritian, so sometimes I accidentally mix Creole in my French. "I sleep," in Mauritian Creole is, "Mo dormi," which is why I messed it up. I knew something didn't feel right before I posted it lol. This isn't the first time I've done that. Thanks for the correction! :)
Because a verb is reflexive in Spanish doesn't mean it is in French and vice-versa. ;) « se reposer » (to rest) and « reposer » (has several meanings, including “rest a part of your body”, but also “put something back where it was”, “repeat / reiterate - a question”, “to lie” for dead corpses etc.) are two different verbs.
le soir (the evening) is like a date, not a duration: la soirée. So, "during the evening" would be "pendant/durant la soirée".
night = la nuit: "during the night/at night" = la nuit or durant/pendant la nuit
evening = le soir or la soirée
Please take a look at this which describes the difference between an/année, jour/journée, etc:
There could be another meaning, if you are holding a thing then putting it down where it was before: "je le repose" = I put it down again.
It can't be "je leur repose", because "leur" is an indirect object. But "je les repose" would mean the same thing as before: I put them down again.