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The increase of the dose of Zoloft (Sertraline) can cause sleep problem, as you are facing currently. To manage this, you can change the time from night to morning or afternoon. If you altogether stop night doses of Zoloft (return back to 100 mg per day), then this sleep issue will me resolve within four to five days.
Another way to manage sleep is to take Seroquel (Quetiapine) 25 mg in morning and 50 mg at night time. By this, your sleep will be normal as Seroquel has sedative property.
Try to manage adequate sleep hygiene, like do not sleep during daytime, no coffee after 5 PM, no alcohol, etc.
For more information consult a psychiatrist online --> https://www.icliniq.com/ask-a-doctor-online/psychiatrist