Cuddling post-sex should be reserved only for someone you actually have a commitment with, not for hookups.
Most people just want to enjoy the last strains of ecstasy in silence; some would even turn their backs on you afterwards. If you really want to at least talk to this person for a good few minutes, then steer the conversation away from personal stuff. Smoke, browse through Facebook, check Twitter, or do other things to pass the time, then get up, take a shower, and leave.
Give them a peck on the cheek before you disappear, though.
Emphasis on one sentence. Okay, so some may ask you to rate their performance or even go into a blow-by-blow detail of what they liked most about the stuff that you just did.
Go to sleep, will you. Or go back to work, if it happened midday.
If they were already your friend before getting it on, then all good — stay friends. But if, prior to the hookup, they were just an acquaintance or someone you met from Tinder or other online dating app, then stay away until the next sack session, that is.
Practice total detachment because some hookups tend to teeter on the dangerous edge of what we call feelings.