What is the current state of the law on the Eighth Amendment when it comes to conditions that prevent inmates from getting enough sleep?

First, it is well settled that exposing prisoners to extreme temperatures without adequate ventilation may violate the Eighth Amendment. See Gaston, 249 F.3d at 164 ("We have held that an Eighth Amendment claim may be established by proof that the inmate was subjected for a prolonged period to bitter cold."); see also, e.g., Corselli v. Coughlin, 842 F.2d 23, 27 (2d Cir. 1988) (claims that inmate was exposed to subfreezing temperatures for three months with ice forming in toilet bowl were sufficient to raise issues of fact for jury, even where prison officials gave inmate extra blanket).

Second, sleep is critical to human existence, and conditions that prevent sleep have been held to violate the

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