One in four preschoolers will have difficulty falling asleep or staying asleep every day, reports CBC.

Researchers at the IWK Health Centre in Halifax, Dalhousie University and Western University are working together on the project. It’s part of a larger study called Better Nights, Better Days that is developing strategies online for parents.

“It’s this part of our daily routine that often gets ignored, but it’s so essential for our sleep habits, for our thoughts during the day, our functioning during the day,” said research coordinator Adam Newton.