system
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human
[Alien Universe] Are the stasis chambers used to conserve consumables (air, water, food) or because of the peculiar nature of their FTL tech?

I used to own (or maybe I still have it in some box somewhere) a book that was written with an in-universe perspective about colonial marine technology. It also had anecdotes relating to the xenomorphs. In it I seem to recall a description of the FTL drive such that while it did indeed propel the vehicles faster than light it had the side-effect of time-expansion for everything inside the vehicle. Thus the 33LY journey to reach LV-426 only takes a reasonable 3 weeks but on board the ship and crew experiences much more than 3 weeks (I do not recall the time expansion ratio).

Is that canon or is the more reasonable rationale of consumables conservation canon.

In the former, the crew needs to go into stasis so that they can survive the effects of accelerated time while traveling FTL while in the latter the crew needs to go into stasis so that the ship only provides minimal life support and they can conserve food, air, and water for when the crew is awake and active.
gpt
I think it's for conservation of resources and crew comfort.  

Deep space missions provide pretty minimalist accommodations.  Spending several weeks in close quarters when there are no active duties to perform is a recipe for disaster.  You don't want everyone to succumb to *space madness*.