yep, DD started sleeping longer when I recently re-did the blackouts, we have blackout blind, curtains then had dark wool blanket covering over as pp said hanging on curtain rail. This was fine for winter but the second the mornings and days got brighter she started sleeping less. So I double folded the blanket and have drawing pinned it over window, result pitch black room even with sun full on window & DD can sleep for England again :-)