So the rumors are that Demi Moore was doing Whip-It’s on the night she was hospitalized.  According to TMZ:

Demi Moore’s friend called paramedics Monday night after the actress inhaled a dangerous amount of nitrous oxide … TMZ has learned.

Sources tell TMZ … one of Demi’s friends who was at her home told emergency workers Demi was doing whip-its. A whip-it is a street name for a type of nitrous oxide inhalant. – read more