Here's a productivity tip which will boost your energies:

We all know the famous story of Fatimah, the daughter of the Prophet Muhammad (Peace be upon him), when her husband, Ali (May Allah be pleased with him) asked her to go ask her father for a servant to help them in their house chores. When she went to her father's house, she didn't find him. Later in the evening, Ayesha the wife of Prophet Muhammad, told the Prophet that his daughter was looking for him and what his daughter requested. The Prophet went to Fatima's and Ali's house, sat between them and said:

"Shall I tell you a thing which is better than what you asked me for? When you go to your beds, say: 'Allahu Akbar (i.e. Allah is Greater)' for 34 times, and 'Alhamdu Lillah (i.e. all the praises are for Allah)' for 33 times, and Subhan Allah (i.e. Glorified be Allah) for 33 times. This is better for you than what you have requested."

Here's the amazing bit, anyone who has actually tried this remembrance before going to sleep will actually wake up next morning full of energy! Scholars and pious men/women who've tried this would swear that it works! And I tried it too and it does work! 

So tonight, and for every night, before you sleep, say SubhanAllah 33 times, al-hamdulillah, 33 times and Allahu Akbar 34 times and watch the wonder of remembrance of Allah take place within you inshaAllah!