The phrase "sleeping on" is a common expression used to describe situations where someone is neglecting to act on a decision or idea. There are several synonyms that can be used interchangeably with this phrase, such as procrastinating, delaying, putting off or postponing. These words all convey the idea of someone not taking immediate action and choosing to delay instead. Procrastination, in particular, is often used to describe habitual delay in taking action, usually due to a lack of motivation or discipline. No matter which synonym is used, the underlying message is the same - taking action sooner rather than later is always better.