Here's part two, as promised. Enjoy.
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Sleepless Nights:
Tony: Sleepless nights are no stranger to Tony. He tinkers in the lab amongst his robots and A.I.s. He'll make coffee occasionally, banging around in his dark kitchen like a blind man. Many half-drunk mugs litter the workshop. The circles under his eyes are so dark that he occasionally steals Pepper's concealer to hide the black splotches.
Steve: He reads, or sits in silence. Sometimes he puts on a record that plays soft music, and he'll hum along. Sometimes, he'll leave his floor and go round to the tower floors, checking on the team and comforting anyone else who might be awake during the night.
Thor: Though Thor does not have many sleepless nights, they do come. When they come, Thor will slip out of the tower, into the night, like a wraith. He just walks. Walks and walks, sometimes for miles. When he returns and sleep still will not come, he returns to Asgard, to his family.
Bruce: When Bruce can't sleep, he rocks. Sits up on his bed, knees to his chest, blanket wrapped tightly around his shoulders, rocking, back and forth, back and forth. Deep breath in through his nose, out through his mouth. Back and forth, back and forth. In, out, in, out. Back and forth, back and forth.
Natasha: The dreams of her past plague her. When she wakes, she often cries. No one knows of these big, shoulder-wracking sobs that leave her eyes swollen and her mouth gasping for breath, but she wants it that way. Sometimes, when she is just too afraid to sleep, she'll slip down to the gym and, earbuds in, will dance. Ballet is a nightmare and a comfort at the same time. Only Clint knows she does this.
Clint: Most sleepless nights occur during thunderstorms. Clint likes storms. He will leave his hearing aids on his dresser and go up to the top of the tower, and just sit on the roof, watching lightning flash and feeling the thunder's vibrations under the seat of his pants. Occasionally Natasha will join him with a gentle hand on his shoulder. He hears nothing, which, sometimes, is ideal.
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Shoutout to KnightLawn who faved and followed not even a minute after I posted this.