What? Basic maths, you say?
Working for a shift costs 25 energy.
Resting for a shift provides 25 energy.
Sleeping overnight provides 50 energy.
The Sleeping Beauty fully restores all energy for resting a shift - a 400% increase.
The Sleeping Woman adds an extra 25 energy for resting a shift - a 100% increase.
Work 1 shift + rest 1 shift = +25 energy, instead of 0.
The Sleeping Maiden adds an extra 10 energy for resting a shift - a 40% increase.
Work 1 shift + rest 1 shift = +10 energy, instead of 0.
That is "basic maths" & they are, quite obviously, not "pointless", or "fucking useless".
Limited use, I would agree with. I have never needed them, personally. But they clearly do serve a purpose.
I've also never needed or used a few of the other cards, such as The Adventurer, or The Immortal, but they all still have a functional purpose.