Deranged Tyrone Brown's 45-year-old victim, who we are not naming because of the crime's sexual nature, had dozed off because of the strong painkillers, which doctors had given her for a foot injury.
The victim's niece told the Daily News: "She woke up and he was over her rubbing his penis on her mouth."
When she jumped up to get away he began to urinate on her.
"She felt a hot splash," the niece added.
Leapt on by Harlem Hospital staff, Brown, 49, suffered an unknown injury, before cops hauled him away to be charged with criminal sex act - a felony.
A spokesperson said the incident will be fully investigated and that they had offered the victims counselling and support.
The victim is however worried that she may have contracted a disease which will remain undetected for a few weeks.
"She's worried and upset," the niece added.