I try to try out at least one new trick for each game I run. I'm starting a new game this week, and I've decided to try using intermissions: cut action and take a 15(?) minute break.
Now, there are normally breaks in my games -- but they more or less happen on their own. The difference here is making it more structured: deciding on the number of breaks and their duration beforehand, and letting players know about them beforehand.
I assume other people have done stuff along these lines, and would be very interested in hearing about their experiences.
Some things I've been thinking about:
One goal is to amp up the energy by letting people rest, and by letting them know approximately when they can rest. I'm a bit concerned about breaks sapping the momentum, however. Possibly either end with a cliffhanger, or lead with action after the break to retain/regain the momentum.
Another goal is to have people take care of their needs during intermission, as opposed to making more tea or taking potty-breaks during the game proper. How long should an intermission be? Just long enough for people to attend their needs, or a bit longer -- so they can get some table chatter out of their system?
How to slice up the session? One big break, or multiple smaller ones? One big and a couple of smaller ones? This depends on the length of the session, obviously.