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Arduino based Alarm Clock that uses 5-Senses!

Hi.  

We want to make an alarm clock that uses all five senses to help wake you up.  However, at the moment we are just focusing on three of the five for our prototype; sight, smell, & sound.  

Does anyone know of similar project that use an time-activated scent release system?  This is the part of the alarm clock that is giving us the most trouble.  Or even better--has anyone heard of a project similar to this where all five senses were used?  

We really need some advice on the process and the technical portion of the prototype.  Any ideas, links, tutorials, pictures, diagram, blogs, articles--they could really help!  

Thanks.