Lets consider two important cases to discuss this topic:
- Deep sleep state
- Waking state
I am not discussing dream state because I see it as identical to waking state.
In the first case, in deep sleep, we do not have any desires, did you notice why? Because there are no gaps in consciousness and infact you are pure consciousness itself which means fully conscious of consciousness. Consciousness in it's totality means no illusion, no individuality, no duality or fragmented reality. When there is no duality or no individual then there cannot be any desires.
Second case, waking state is tricky. In waking state, there are gaps in consciousness. Now what does this mean? When you are present in now and here, then you are actually intensely conscious. When you are lost in past and future, which are illusory concepts then you are not completely conscious. You are then kind of sleep walking. So in other words, delving in past and future creates gaps in consciousness in waking state. On the other hand, if you notice, imagining past and future creates a personality or existence of an individual. When individual comes to an existence then desires become part and parcel of such an individual. Hence, more the gaps in consciousness more will be the desires and more individuality and bondage caused by duality.