Hay is associated with fun and relaxation, so if you dream about hay, it can be a sign that you need to relax and unwind.
You may dream about hay if something that happens in your life brings up positive memories for you.
A cart full of hay in a dream can be a symbol of prosperity. If you dream about a cart full of hay, your dream can mean that you expect to be successful, or that you are hoping for success.
Dreaming that a horse is carrying hay in a cart can mean that you need to take responsibility for your future.
A dream that you find wet hay can be a warning that you should be understand the risks associated with any project that you plan to undertake.
If you dream that you unexpectedly come upon a haystack or a loft full of hay, you are expecting good luck.
A dream about hay can have sexual connotations.