Define a concrete target
“Study” or “write” is open-ended. “Review sections 1–2 and answer five practice questions” gives the session a visible finish.
Prepare the workspace
Open the needed files, gather materials and close unrelated tabs before the session. Small setup decisions consume attention once work begins.
Make distractions less convenient
Silence nonessential notifications, move the phone away when practical and keep a scrap list for unrelated thoughts that can be handled later.
Close the loop
At the end, record what changed and the next action. This makes the next session easier to start.
This site discusses planning and work habits, not medical treatment or diagnosis. Persistent attention, sleep, stress, or health concerns deserve support from a qualified adult or health professional rather than a productivity hack.