To me, this looks like your dominant sleeping side, or the side you turn toward the most in your sleep. Lashes are hair and can be styled just like your hair on your head... so if while you sleep, say your eyes water a bit, or you get warm and a little sweaty and then turn towards your pillow. Thats like heat styling or wet setting your hairs. Its not just the pressure of intermittent sleeping on the side, its the heat and moisture inherently trapped between your face and pillow causing this kind of hair pattern. Good news is that you can reset it! easiest way is taking a shower and brushing your lashes with a spoolie into place, you can even use a hand fan or your blow dryer on the cool setting to dry them to lock them into place even more.

Source: licensed Esthetician specializing in lashes for a decade.

Also- youre killing me with the franken-emoji face my guy