Actually working for hours on computer and disturbed sleep - both can aggravate under eye dark circles. Try to take short breaks in between. Wash your eyes 3-4 times in between the work. Take balanced diet. Massage your eyes with few drops of almond oil using ring finger. You can also try some home remedies like putting grated potatoes on the eyes for 20 min. and relax.
You can also use cucumber or tea-bags to get the soothing effect.
If your problem still persists you can start using any under eye dark circle cream containing AHA. You can also go to a cosmetic clinic and they may assist you more..