I don't know if it's a vivid dream or an actual TV show or film but I think kids were able to go under their duvet in their beds and it led to some magical tunnels also made out of duvets that led to other times/places/dimensions.
I remember the tunnels were small so had to be crawled through, and some and the end of the tunnels were like portals that you could see the other worlds through and access them from! I think maybe one portal was an Egypt or desert thing.
The kids were white, both boys and girls and aged approximately 9 to 13. I think it was a U.K. T.V. show, but it may have been American.
