They just play with the nervous system and jumble up the brain chemistry. You ascribing those experiences as something supernatural, or spiritual is the problem. The experience is just that. A fleeting experience. To constantly demand an experience over and over again, or to ascribe certain experiences some great importance is just you interpreting those experiences. Everyday life is just as "spiritual" as anything else. It is the newness, and uniqueness that you demand. This uniqueness of experience is only demanded by the knowledge that you have. Otherwise you have no way of telling yourself that it is a unique experience. As each moment in life is a unique moment.

There's nothing really spiritual about it. There's nothing really special about it. It's the value that you ascribe to it, through the knowledge that you have which makes it "special".