Drowsy

Drowsy, A.K.A. Experiment 360, is an illegal genetic experiment created by Jumba Jookiba. He is designed to put his victims to sleep by bleating; only water in the face can awaken them. His one true place is putting insomniacs to sleep. Drowsy is voiced by Tress MacNeille.

Bio
Experiment 360 was the 360th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to use his sleep-inducing bleat to cause his victims to instantly enter a near-permanent sleep.

360 and the other first 624 experiments were deactivated and smuggled to Earth by Jumba during his mission to capture Experiment 626.

All of the experiment pods were released and scattered across the island of Kauai.

Lilo & Stitch: The Series
360's pod was one of the twelve experiment pods recovered by Lilo and Stitch in "Drowsy", along with 102 (mislabeled 239), 274, 204 and presumably 604 (as his pod was seen with Jumba in "Houdini").

Because Lilo hadn't got much sleep lately, Stitch activated 360 and used the experiment's bleat to put Lilo asleep. However, Stitch had no idea how to wake her up when Nani called for her later.

To try and solve the problem, Stitch tried to make Lilo seem awake by putting sunglasses on her, mimicking her voice, and moving her around like a puppet all over town.

Meanwhile, 360 escaped and was chased all over town by Jumba and Pleakley, while 360 put everyone he encountered to sleep by bleating. Pleakley had unknowingly caught 360 in his purse, but then opened it to put Gantu to sleep when the latter was looking for the experiment. At that point, however, 360 jumped out as Gantu fell on Pleakley. Jumba then scolded Pleakley for letting 360 escape.

Gantu was later woken up by a bunch of people on the beach, who thought he was a beached whale and dumped water on him. He then got a call from Hämsterviel, who demanded 360.

Stitch had been unable to wake Lilo up all day, until Jumba revealed that the cure to 360's sleeping powers was to spray water in the victim's face. After Lilo was awakened, Stitch told her that she had to go meet someone at the airport. Because she'd been asleep at the time, Lilo started to worry, but Jumba reassured her that Stitch had taken care of all her appointments.

Later, after a long chase, Gantu and Experiment 625 captured 360 at the Birds of Paradise Hotel. However, when they attempted to use 360 to kidnap Regis Philbin (the man from the airport) while posing as bellboys, Lilo and Stitch were there for Regis since he stepped off the plane, and protected him in every way they could.

Lilo eventually recaptured 360, named him Drowsy, and let Regis stay at the Pelekai household. In the end, Drowsy used his sleep-inducing powers to send Regis and everyone in Lilo's family to sleep.

In "PJ", Lilo convinced Drowsy that Stitch was having trouble sleeping so that he would put Stitch to sleep, allowing Lilo to release PJ. Strangely, however, Stitch woke up on his own.

In "Ploot", Drowsy was one of the second team of experiments (along with Finder and Babyfier) formed to try and stop Ploot. However, Ploot was easily able to defeat them, forcing the three experiments to retreat.

In "Remmy", Drowsy was one of the experiments in Lilo's dream.

Leroy & Stitch
The first 624 experiments, including Drowsy, were rounded up by Leroy and taken to a stadium to be destroyed. However, Lilo, Stitch, Jumba, Pleakley, Reuben and Gantu arrived before the experiments could be destroyed.

It is unknown whether or not Drowsy participated in the following battle between the experiments and the Leroy clones.

The Leroys soon gained the upper hand in the battle, but were defeated when Lilo, Stitch, Reuben and several other experiments performed the song "Aloha `Oe," which caused the Leroy army to shut down due to the original Leroy's fail-safe.