It's called Jupiter : The Bringer of Jollity from The Planets by Holst. It is from his piece called 'The Planets'.

Standard Snippet: Since Bingo's dream focuses heavily on planets and outer space, parts of Gustav Holst's The Planets are incorporated into the episode's soundtrack, particularly 'Jupiter'. We’ve also sat through all of The Planets because of Bluey.

Much of the episode shows her sleepwalking anyway, and how what happens around her influences the dream she's having.

Sleepwalking: Bingo apparently has a habit of wandering around the house while asleep, since she promises Chilli at the start of the episode that she'll stay in her own bed this time.Unlike the other 'please faces' in the series, however, there's no close-up on Bingo this time. Rondo alla Turca by Wolfgang Amadeus Mozart in Magic Xylophone, hilariously played by Bandit on Blueys belly, which turns into the musical accompaniment. Puppy-Dog Eyes: After Chilli is done reading a book to Bingo, Bingo digs out a second book from under her pillow and uses a 'please face' to get Chilli to read it to her. 0:00 / 6:48 Bluey - Sleepytime soundtrack RareMusicTube2 1.83K subscribers Subscribe 300 Share 26K views 1 year ago Soundtrack of the episode 'Sleepytime' of the second season of Bluey.Marshmallow Dream: Several times, the episode cuts from Bingo's dream to her performing the same actions in real life, such as when she dreams she's bouncing on Jupiter and she's actually bouncing on Bandit (rather uncomfortably for him).Groin Attack: While Bingo dreams of bouncing on Jupiter, she accidentally bounces a bit too hard in a certain spot sensitive to Bandit.Frothy Mugs of Water: Bandit sleepily sings '99 bottles of 'thing' on the wall' to Bluey, neatly avoiding the word 'beer'.Dream Episode: The aptly named episode takes place mostly while Bingo's dreaming, but it will often cut to the real world to show how it influences her dream.It starts with immediately contrasting Bandit and Chilli’s two parenting styles: Chilli is calmly reading a story to Bingo (using words), while Bandit is.

Bingo's dream starts and ends on a close-up and zoom out respectively on the book of planets that Chilli read to her. This episode is 7:30 instead of the usual 7 minutes long, which I greatly respect because not a single moment of this entire episode should be cut. After a bit of back and forth, they both tug the sheets at the same time, sending Bingo airborne. Blanket Tug O' War: Bluey and Bandit fight over the blankets and jostle Bingo around, which also occurs in her dream.An Aesop: Even if your loved ones can't always be with you, their love never leaves you.Bingo tells her mom that she will wake up in her own bed the next morning, and she has a dream about a space adventure with Floppy. Short Epic Neptune Version of 'Sleepytime' soundtrack of Bluey, by DJ Phoenix.Note: No copyright infringement intended. Mum reads bedtime stories to Bingo and kisses her goodnight.

Bluey sleepytime song