John would like to call them nightmares, but he's wide-awake.

oops! Sherlock slipped off the roof

Sherlock never meant to fall so much as saunter vaguely downwards

Sherlock tells john he's only sauntering downwards. He's not actually falling. Although, how vaug it is is unnecessary.

Sherlock explains the great difference between falling and sauntering vaguely downwards.

wat nop

John is startled. Sherlock is bored.

Sherlock is bored senseless and tries to seduce John from his armchair through a promiscuous pose

sherlock struttin' his stuff