Trouble sleeping

Am entering a new phase . While I usually never have any trouble falling asleep on normal nights, am finding it challenging on days when work is stressful 

It's that feeling when you are bone tired , you doze off , only to be woken up because your body wouldn't stop twitching. It's happening to me . This job on days when I have to work late , is giving me these twitches . For no reason , I stretch my arms and my legs in the dozing off stage , and my body just keeps doing this over and over