This is your test.
Do you give in to the previous pattern or do you stand up for yourself, swat away the old, and resume your new, better actions?
Sometimes you persevere, and other times you slip. The key to moving forward, though, is to reinforce your resolve. Refresh your memory by recalling your “why”: Why did you change this habit? Do those reasons still make sense? Do you feel compelled to continue with your strategy for change?