Anand(joy/bliss) is continuous while sense pleasures are ephemeral, because when sense born desire is fulfilled, the agitation due to desire halts for brief period, this is when we feel brief satisfaction or pleasure, as mental process resumes, thoughts rush in and agitation is felt. While in deep sleep as ego/mind subsides, what is left is Anand, our ture nature. It has no ups and downs, in anand there is no I or Me so technically there is no experience because experiencer “I” is absent, it remains non dual, stable, continuous and bliss. Nobody can deny it whether, its human, anmial or plant every body knows this bliss but cannot describe it. The bliss is always present, but mental processes doesn’t allow us to concentrate on it, as mental process subsides the Bliss is God.