A teacher at a Northern California preschool accused of putting sleeping pills into toddlers’ sippy cups has been released from custody after being charged with child endangerment.

59-year-old Debbie Gratz is scheduled to appear in court again later this month.

She was arrested Friday after a colleague at the Morgan Hill Kiddie Academy saw her put an unknown substance into the children’s cups.

School officials notified police on Monday, who said Gratz acknowledged putting the over-the-counter sleeping aid “Sominex” into the kids’ drinks.

None of the children drank from the cups the day the incident was reported.