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Your peak alertness will likely be in the first three hours after waking; use that time for complex work before the afternoon "crash."
Outside, the wind occasionally rattles a loose shingle, a sudden sound that pulls the focus back from the edge of a half-formed thought. There is a specific kind of loneliness that belongs only to the sleepless. It is the feeling of being the only passenger on a ghost ship, sailing through a sea of silent houses where everyone else has successfully slipped behind the curtain of the subconscious.
You try the old tricks. You count breaths, watching the invisible thread of air enter and leave. You visualize a white room, trying to bleach out the technicolor worries of tomorrow—the emails not sent, the tone of a conversation from three years ago, the sudden, inexplicable fear of the future. But the mind is a stubborn architect; it keeps building new rooms, new scenarios, new "what-ifs."
Avoid heavy, carb-rich meals that trigger drowsiness. Opt for lean protein and plenty of water.