For many people, insomnia involves not being able to get to sleep. Mine, when it manifests is in the form of early morning awakening. Its incidence comes in waves. Sometimes I have no problem for weeks at a time. Then there will be a period when I do wake up at 3 am or so, but fall back asleep almost immediately. Then comes a period, such as the one I'm going through now, when I wake up at 4 or 4:30 am or so. My usual wake time is 5:30.
So, this week, I've been hitting the writing chair way early. That can be great--I can get my fiction stint in, then turn to client work, and not have a time crunch later in the day when exercise bumps up against other required tasks.
But sometimes it also gives me an excuse not to work. "I have an extra couple of hours!" I, for some reason, say. "That means I deserve to goof off." It doesn't help that self-control is lessened when I haven't had enough sleep--and willpower is not something I have an oversupply of to begin with.
I do have a project I want to get done before I go on vacation (a revision of a novel about my detective, Sere Glagolit), so today, Saturday, I've been working since about 5. And I'm ready to take a break!
So, using the time makes it valuable, giving in to temptation and goofing off makes it a curse. You might think that decision would be easy.... But if you are realistic, you know how hard it is.