It will take a week or so for last night's debate to show up in polls. People need time to talk and think about what happened.
Trump was going for an alpha-dog vibe with his constant interruptions of both Clinton and moderator Lester Holt. My impression is he came off more like a whiny chihuahua yipping at people's heels.
My favorite line commenting on the debate is from a commentator on the conservative Townhall website, "[Trump] just doesn't have the stamina to fake sanity for an entire debate."