Initial insomnia or hypersomnia
During the initial side effect phase of helminthic therapyThe reintroduction to the digestive tract of a controlled number of specially domesticated, mutualistic helminths (intestinal worms) in the form of microscopic eggs or larvae to reconstitute a depleted biome to treat and prevent chronic inflammation, autoimmune disease and other immunological disorders including allergy., some self-treaters may experience insomnia or hypersomnia - especially if they have taken larger doses - while others report improved sleep.
Insomnia has been noted by an HDCHymenolepis diminuta cysticercoids (Hi-men-o-lep'is dim-a-nu-ta sis-ti-sur-koid) - the larval cysts of the rat tapeworm, Hymenolepis diminuta user.
I took my second dose of HDCHymenolepis diminuta cysticercoids (Hi-men-o-lep'is dim-a-nu-ta sis-ti-sur-koid) - the larval cysts of the rat tapeworm, Hymenolepis diminuta
8 days ago and have been suffering from insomnia. Nothing too bad just waking up 1.5 hours earlier than normal every day which is very unlike me. I took 30 the first time but this time took 50 just to see how I tolerated a higher dose. I have also had nasal congestion. 
And by several users of NAthe human hookworm, Necator americanus.
This is day six since my inoculationThe introduction of an infectious agent into an organism. [http://helminthictherapywiki.org/wiki/index.php/Helminth_inoculation Helminth inoculation]
and for the past two days I've felt a little hyperactive and have had pretty bad insomnia. Although I am prone to these problems anyway, it's pretty unusual for it to happen a couple of days in a row like this… I notice one other poster mentioning a deterioration in sleep quality after about 10 days. 
For the past two weeks (after inoculating with 5 NAthe human hookworm, Necator americanus
) I've barely slept. Some nights I'm getting as little as three hours and then I'm still awake the next night even though I feel tired. 
I inoculated with 5 NAthe human hookworm, Necator americanus close to 3 weeks ago and I've suffered from insomnia for the last 5 days or so. This is highly abnormal for me as I usually fall asleep in less than 1 minute. Sometimes I fall asleep in less than 10 seconds according to friends. (I might have narcolepsy, haven't been tested) Now it takes me 3-4 hours to fall asleep every night and I still wake up 5-10 times after that. I haven't had insomnia in over 10 years.
A few self-treaters have experienced hypersomnia.
I took my 6th dose of HDCHymenolepis diminuta cysticercoids (Hi-men-o-lep'is dim-a-nu-ta sis-ti-sur-koid) - the larval cysts of the rat tapeworm, Hymenolepis diminuta
. Now, I am in my 11th week of taking those. The only side effect that I have really felt consistently throughout the entire journey thus far is sleepiness. I would not call it fatigue because I am not exhausted at all. There are moments when I just have to fall asleep. This is a huge shift from my sleep deprived past. I would never sleep more than 4-5 hours per day in the past 10-12 years. Now, it is like ‘hey, I know you just slept 10 hours last night, but how about a 2 hour nap? 
5 days post inoculationThe introduction of an infectious agent into an organism. [http://helminthictherapywiki.org/wiki/index.php/Helminth_inoculation Helminth inoculation]
(with 35 NAthe human hookworm, Necator americanus
) and I have excessive sleep. I sleep my usual 9 hours, get up for 2 or 3 hours of feeling woozy and then get so tired that I can't stay awake. I sleep another 5 hours. Then I get up for 7 hours and feel pretty good. At the end of that I get tired so quickly and intensely that the first night I fell asleep at a friends place mid-conversation, and last night on my computer keyboard at my desk. Being properly awake for only about 7h/day is a bit of an issue, but I am getting good deep sleep that I am hard to awake from, so I don't think it is a matter of sleep quality. 
I've also noticed the excessive sleep issue post inoculationThe introduction of an infectious agent into an organism. [http://helminthictherapywiki.org/wiki/index.php/Helminth_inoculation Helminth inoculation]. I'm normally good on 7-8 hours of sleep, but now I wake up tired after 10+ hours of sleep, and I get super tired towards the end of my work day.
Early sleep improvement
Improvement in sleep may begin early.
My (NAthe human hookworm, Necator americanus
) bounce effects: … increased quality of sleep - had first dream I could remember the details of for longer that I can recall. 
I’m 3 weeks post 25 NAthe human hookworm, Necator americanus inoculationThe introduction of an infectious agent into an organism. [http://helminthictherapywiki.org/wiki/index.php/Helminth_inoculation Helminth inoculation]
and last night I actually got sleepy at 10pm, I haven’t felt like that since I was a kid. I felt sleepy and gradually just fell asleep, like a normal person. It was amazing... If this is a permanent effect of NAthe human hookworm, Necator americanus
I will stay on them forever, even if they don’t affect any of my other symptoms! 
Long term sleep improvement
The quality of sleep is frequently improved in the long term. (Several of the following comments were made in a now deleted thread in the Helminthic Therapy Support group on Facebook.)
I've lost that 'tired but wired' feeling that stopped me relaxing properly, and I've started to sleep better.
After 9 months and 45 HWshookworm, usually referring to the human hookworm, Necator americanus later I have stopped with all sleeping medications… I am waking up with more energy, going to sleep naturally, and not crashing during the day. I credit the HWshookworm, usually referring to the human hookworm, Necator americanus with this improvement after suffering for more than 6 years and trying many different treatments with no improvement.
Yesterday she went to sleep before the rest of us. This has practically never happened.
Two months ago I could not sleep without a dose of salbutamol, and that only for three hours of sleep. It was hell. I thus spent the last two years. I was so worried and so resorted to HThelminthic therapy. Now I wake up with the alarm again!
Sleep quality improved beyond recognition. 
My Circadian rhythms have normalised and I am getting 8 hours of solid sleep every night. 
Before I needed a good 8 hours and more - now about 6 and a half to seven is plenty.
His sleep is much better; his hypopnea is significantly reduced. The amount of naps he takes have been cut way back. He doesn't have to sleep fourteen hours on the weekends now. He sleeps better at night because he is much less congested. 
Helminthic Therapy Wiki: documenting the science, management, experience and results of helminth replacement therapy.