This is not true for everyone. We all have different reasons for similar feelings like this. I sleep great but still feel like this. Oversleeping is also a sign of depression.
For me, getting my diet under control and truly understanding what my body needs has helped tremendously (more fiber/protein, less carbs/sugars). Introducing daily probiotics has helped too. It really is amazing how our diets affect our moods.
For some, regular exercise may help.
For others, sun lamps help with seasonal depression.
Sometimes you need medication.
Sometimes weed helps.
Always talk to a professional. Try different things until you figure out what works and what doesn't.
People dealing with these types of issues are just a little tired of hearing "just go for a walk, drink some water, and go to sleep" from everyone, nothing personal.
Lol when you're constantly told that the solutions to your sleeping disorder is to "just go to sleep", or that you can overcome your ADHD or depression with "just focus" or "just do the thing", it gets pretty tiring. And that is the experience shared by this post, and the experience that the majority of the people in this thread that also relate to the meme have.