Sleep is still a useful spell but you have to consider how easy it is for enemies to wake each other up. Use it in situations where they are isolated. If you put an enemy to sleep, it misses it's go and another character has to dash to reach it before waking it up then you've done pretty well for a level 1 spell slot. Alternatively it is useful to end fights.
As for jumping yeah, it's kind of bizarre jumping is actually FASTER than running. Difficult terrain is scarcely a thing since enemies just jump up over and aroud it.
The problem is that it is very difficult to find a single target. They are all nearby and there are many of them. Goblins, bandits. I also wrote that the opponents may not even miss their turn, one of the many enemies will push him, you need to look not only for a single target, but so that she also goes before everyone else. There was also a problem with only the first cell, but this is not enough to put the bandit to sleep, because of their large hp. In dnd, you roll a 5d8 cube, here it is fixed below average. It is necessary to spend at least a second cell and most likely it will fly away to nowhere.
