Peace of mind at a glance. The enhanced Groegg changes colour with the temperature of a room. A yellow glow means a safer temperature for children to sleep in. The Groegg also acts as a nightlight. The colours of the Groegg match the tog labelling on the Tommee Tippee sleepwear range. This helps make choosing what baby should wear at bedtime for a comfortable night’s sleep much easier for parents, helping everyone to get a better night’s sleep.