Bad habits charge interest. The sooner you pay them off, the less they cost.

A habit does not cost the same amount every day; it gets steadily more expensive. Sleep debt, avoided work, a situation nobody has addressed, all of it compounds, so the version you deal with in six months is larger than the one available now. That is why postponing feels cheap and turns out not to be. The price rises quietly while you are not looking at it.

Pick the one currently costing you most and make it slightly harder to do this week. Not eliminated, only inconvenient. Early and partial beats perfect and later.