As soon as the 3 hour energized moodlet wears off, you can start swiping again! :naughty: Also, the higher their mischief skill, the pricier things they can steal. I like to pick a sim's house and only steal from there (especially if the sim was mean to me).They also steal at work (a lot of dirty dishes for some reason), and this doesn't count towards the energized klepto moodlet.
Also, sims will get a tense moodlet if they haven't swiped in a while. Stealing from work doesn't alleviate the moodlet.