You don’t need to stay awake long - just long enough to realise that you are awake and reinforce your intention to have a lucid dream. Once you feel that you are awake, take your mind back into the dream you were just having. Try to re-live it and feel all the feelings you were having in that dream. Tell yourself that in your next dream your mind will realise that you are dreaming
and really believe it. Once you learn to really believe it you are planting a seed in your subconscious mind which will make you become aware that you are dreaming. While you are remembering your dream, imagine a dreamsign
and see yourself becoming lucid when you recognise it. Stay awake just long enough to do all this, if you stay awake too long you will find it hard to get back to sleep. Drift back to sleep with this intention firmly set in your mind. Expect it to happen and give it great importance in your mind. Only then will your mind make you become lucid.
Lucid dreaming is easy - if you believe it is.