Have you changed your sleeping habits at all? Waking up earlier, going to bed later, using anything that might increase grogginess or exhaustion?

If you don't think about your dreams shortly after waking, you will lose memory of them once you start moving around. Even when you used to always remember dreaming, you probably weren't remembering every single dream. You would have woken up multiple times throughout the night, but gone back to sleep within seconds and had no recollection of doing so.

Perhaps try putting a pad of paper next to your bed if you don't have one there already. As soon as you wake up, don't think about what you have to do that day or what happened the previous day. Instead, try to remain as motionless as possible while you attempt to remember and replay what you had just been dreaming. Even if all you can remember is "It took place in a forest", write that down on the pad of paper.

So long as you are waking up mindful of what you had been dreaming, your dream recall will improve over time. Not only will you remember more about your dreams, you'll also remember the ones from the middle of the night that would otherwise be lost. Back a couple years ago when I was more diligent in recording my dreams it wasn't unusual to have written down 4 or 5 every night. It's a fantastic resource for creativity.