Ideas to make the game (realistically) challenging

Here's one that I've been thinking of--

Try having your sim not sleep on the bed or any comfort objects. For them to keep their energy up, have them drink "Sleep Replacement" potion from Reward Store. Do this as much as you can without your sim sleeping on the bed, couch, chair or the floor. To score yourself, count the number of Sleep Replacement potion you have consumed.

Let's call this the Don't Sleep Challenge.