I've erected the Tesco Dome 2 man pop up tent in my DC's bedroom (aged 5 and 3 yrs). Theyre so excited that they've crawled in, cozied up into the blwo up matress and duvets, and gone to sleep straight away. The tent is already quite warm, so no heating on in the house. But, is it safe? I've never slept IN a tent IN A HOUSE so am starting to fret. Am I being silly?