As someone else mentioned, that study has come under fire. It's also one I never agreed with because for me personally it wasn't true. I have always found things like discipline and willpower to be more about inertia than anything else.
If I wake up and start playing a video game or eating crap, that inertia carries through the day. The reverse is also true, if I get up, workout, and start being productive that will carry through the whole day. Once I realized this about myself I adjusted my whole schedule around. Instead of after work workouts, I moved them to the morning. Instead of staying up late, I get up earlier and naturally go to bed earlier. So instead of wake up and chill and ease into my day, I wake up and go. And, that go carries through the entire day.
If I wake up and start playing a video game or eating crap, that inertia carries through the day. The reverse is also true, if I get up, workout, and start being productive that will carry through the whole day. Once I realized this about myself I adjusted my whole schedule around. Instead of after work workouts, I moved them to the morning. Instead of staying up late, I get up earlier and naturally go to bed earlier. So instead of wake up and chill and ease into my day, I wake up and go. And, that go carries through the entire day.