Preventing dwarven breaks
1: Create a kickass break room, complete with furnishings made out of iron, glass, and other fun materials like bauxite and nether-cap wood. the walls should be constructed clear glass if possible, so others can watch what's going on in your lovely break room.
2: Make sure your brake room includes dandy floor hatches linked up to a lever! It should have them in the ceiling too! Surely, this will only allow in glorious mist-generating waterfalls.
3: Hook up hatches above the break room to one lever, levers on the break room level to another.
4: Fill area above breakroom with magma, so your dwarves can bask in its radiance
5: When lazy tired dwarves want to take a break, burrow them in the breakroom so they can enjoy it properly.
6: Lock the doors, pull the lever, and drown the bastards in magma while the rest watch.
7: Pull both levers, stopping the flow and draining the magma. Anybody else want to take a break?
Ideally, when you randomly burrow-and-magma dwarves on break, you'll only catch the laziest dwarves. a few rounds of natural magma selection later, and the driven, self-starting dwarves will still be alive and not taking breaks. if they witnessed a lot of their lazier cohorts burning to death, they might not care about anything anymore either, making them hardened against bad thoughts!
Really though, all breaks at once is just bad luck. that sort of thing happens. now, if it was parties I could tell you to free all the rooms where dwarves will hold parties.