I speak from experience when I say that it is crucial that you get enough sleep. From comparing my weekends (when I get enough sleep) to the weekdays (when I get far too little), my recall vastly improves on the weekends. You really need to strive to maintain a consistent sleep schedule. It may be tricky to work your schedule around lucid dreaming, too. If all else fails, see if you can find a moment to nap during your day, preferably 5 hours or less from waking up. Other members may be able to offer you more/better advice.