May be experiencing psychosis.
The main problem I initially thought it was because of was my astigmatism, which basically looks like TV static to me, and it causes things in my vision to jump around a bit, especially during the dark. I do keep irregular sleeping hours, but this has been going on for the better part of half of my life when i hadn't wrecked my sleep schedule. I've seen people, spiders, and bugs. Only had one auditory hallucination to date. But within the past month or so, I've felt like bugs were crawling all over me, which made me tear my room apart for any source only to find none. I washed my sheets and still felt stuff crawling over me. I know my eyes are unreliable, so I can normally calm myself down with that fact. But the feeling of bugs crawling on me combined with my mind warping everything I see is making me paranoid as hell.
Writing this, I saw a scar on my leg from years ago and thought it was another bug and freaked.