I've pretty much always had that, but if it's something I enjoy it's no problem. even things that usually wouldn't be considered as purely entertainment(like spending hours reading articles online looking up things about a ceryain subject I found that's interesting, will spend a few days like that and go a while without again untill I find the next subject)
in highschool a teacher once said to me I was a strange/interesting case, since I wasn't fully demotivated like the usual demotivated and underachieving students, but I was just demotivated for schoolthings, but not in learning in general
I noticed I'm most productive under optimal conditions. enough and good sleep(in my preferred shedule), enough free time and relaxation, etc. and even under those conditions I spend a lot of time procastrinating. but, even in my procastrination I can be productive since I will do the smaller or more pleasant tasks to feel less bad about not doing the task I'm procastrinating for. and that way it also builds up less, altough sometimes I make up new simple tasks wich have no urgency
what I have noticed is that not vaping only makes it worse. I actually had some stuffto do today, did work on it the previous days but only a little each day. so I had decided to today do a big portion, and to only vape after it. should've known better, without vaping I'm even lazier, and time flies by a lot faster if I'm sober. so while I was just quickly checking some things online a few hours went by.
I actually have experienced this before, but as I haven't tried ot for a while I start disbelieving my own experience again. once I wanted to keep a tolerance-break of a week, had to break it up after a few days since time flew past so fast without any task, and worst of all it was even more difficult to to get up early.
this aplies to a free time-environment tough, I've never liked being high in a school/work invronment since as I said time flies by a lot faster if I'm sober. so it's perfect to extend and maximise my free time. but tasks that have to be performed at home are what I said really aplies to.
one of my favorite evade-tasks now in spring is gardening, it's something I love(especially high), and requires regular time-investment this time of year, and it's a task I have to do for the future(harvesttime), so it's pleasure and task-completing at the same time. but for that reason it tends to be good at pushing away other tasks...
the problem is, I could force myself to do a task, but if I'm not into it at that moment it just won't go and I get nothing done. untill the last day when it finally has build up enough. so another technique sometimes try is to stress myself. I'm not rea;;y someone that stresses easily, but soetimes I wish I was. but I can stress myself a bit, in my head increasing and overestimating the importance and consequences of the task at hand, trying to convince myself it's really hard and I will have a very hard time etc.
sometimes it works, sometimes it backfires and sometimes no effect(when I can't convince myself of the importance and so don't get any stress).
what also works is frequent breaks, whenever I notice my attention dwindling I watch some tv for a while or do something else for myself, vape some. while performing the task I will also vape but just an incidental hit/puff, to keep it at a reasonable buzz but not too strong either.