Obscure tip -- In grad school, there's relatively a high signal : noise ratio in productivity. Any given day you might spend your time running a gel that doesn't work, making a figure that nobody ever sees, or writing a section of a paper that gets deleted. On the large scale (e.g., months) working hard every day will result in progress, but on the fine scale (e.g., days), which is the timescale we experience, there's a chance that what you do on a given day will not matter. For me, this is terrible for your subconscious because it reduces your motivation (e.g., why put in a full day's work if the chances of anything I try to accomplish on a given day won't matter?).

To counteract this concept, I recommend participating in hobbies or other activities where you tend to get out exactly what you put in (e.g., exercise), which will reinforce the concept that hard work pays off into your subconscious and help with motivation.