You're definitely not alone. It goes by different names, energy, motivation, attention but in the end it's something we need more of to get everything done. Here's an ordered checklist of how to improve your situation (https://www.quora.com/Life-Advice/What-are-some-effective-wa...)
One way to beat this system is through pacing. This is by working towards short breaks (https://medium.com/the-productive-self/7bdf1f026431) or towards time limits to prevent procrastination (https://medium.com/p/ee13c1600b6b). I wrote these posts after hearing about these situations again and again. I am currently working on Catalist, a tool that effectively deals with these situations of task and flow management (http://signup.catalist.me/).
One way to beat this system is through pacing. This is by working towards short breaks (https://medium.com/the-productive-self/7bdf1f026431) or towards time limits to prevent procrastination (https://medium.com/p/ee13c1600b6b). I wrote these posts after hearing about these situations again and again. I am currently working on Catalist, a tool that effectively deals with these situations of task and flow management (http://signup.catalist.me/).