Struggling with motivation at work

These days, I feel lost at work. I keep procrastinating, with the first half of my mornings consumed by calls, and by the afternoon, I feel sleepy. I tell myself I’ll work at night but end up postponing it until early morning. I give 'in progress' updates during stand-ups, and somehow manage to finish everything under pressure on the last day of the sprint. It feels like I can’t motivate myself to work until the pressure hits. How can I overcome this behavior?