What to do if you feel that there is no energy to do something?

Lying down without sleeping. Shorter power naps. Meditation. Changing your life situation so you aren’t upset about it. Taking breaks and stepping outside. Changing/improving your work location (lighting, noise, distractions, air quality). Various other personal developmental approaches.

@Zaku When I lie down and try to keep my eyes open,I still sleep in few minutes

Is that normal for you? I usually associate that with needing to catch up on sleep a lot. Or at least add a few extra hours of sleep every night by going to bed early.

There could also be something biochemical going on, perhaps even from diet and/or caffeine use. I would try seeing a doctor, or better a good naturopath or Chinese medicine doctor (since both of the latter two may be much more likely to prescribe herbs over pharmaceuticals, which I would prefer).

Could also be depression from hating your work, or Seasonal Affective Disorder from not enough sunlight exposure…

So I’d start trying things. Getting a bunch of extra sleep may the easiest first try.