Sleep, in EA is an absolute joke - it's been nerfed into the ground, so thanks for bringing it up: First, it's not a saving throw spell anyway, so it's not overly relevant to this discussion... beyond that, monsters have increased Hp, so sleep can affect fewer targets. Sleep now only lasts for two rounds, instead of a 1 minute. Sleep is broken easily by the increased amount of ambient surface and radiant damage that the game throws around, and by the fact that every creature has a bonus action to shove a sleeping target - when the sleep spell calls out specifically using an action to wake a target up. Sleep never lasts on any creature fro more than one round, if it lasts for around at all and the target isn't woken up by the time its turn comes around (it usually is), and you will NEVER hit more than two targets with it. You are literally ALWAYS better off casting a reliable damage dealing spell with that spell slot, than you are casting sleep, in the current EA. What encounter, I'm curious, have you 'just ended' with sleep, in the EA?
Some of this is true yes, but not all of it. Most hp was nerfed back down btw and you are forgeting that AC attack on sleeping target will always hit and will be a crit...so that alone gives you shit loads of value if done right. But i agree sleeps needs a rebalance indeed.
You can force AI to suicide with a well placed sleep spell on group of AoO. So yeah the shove wake up needs to go AI is addicted to shoving! So much so they forget what AoO is! Sleep It's broken op when used to bait AI into moving.