All kids tv is made on drugs. In the night garden is even more trippy than teletubbies.
The night garden is definitely trippy. For the occasions that I lose the battle and let my son have some tv before bed, cbeebies actually goes a great wind down job with the night garden.
If you think that's trippy, you should try turning on "Baby TV" around ~3am-5am or so. At least that was absolutely crazy when my son was a toddler and waking up at 4am. Soothing, but very, very trippy.
To quote Charlie Brooker talking about Oliver Postgate (it's a brilliant piece of TV - watch it, it's on YouTube)
"Saying what were they on is an insult to the intelligence of the creators"
Although I agree some kids TV is gloriously mental