Why do I feel so drained after casting a

Short answer: yes, feeling wiped out after a long ritual is common — but it isn't because energy left the room. Tarot doesn't cast spells and I don't do ritual work, so I can't tell you what your rite "did" to you; what I can say is that the tiredness usually has plain, checkable causes.

The ordinary suspects

• Late night + standing + stillness. Most ceremonies happen at the worst hour for sleep, and ritual posture is motionless. That alone reads as "drained" next morning.
• Breath-holding or focused breath work. If you held, slowed, or deepened your breath to work the ritual, the drop afterward can hit hard — it's a real physiological after-effect, not a mystery.
• Candles, incense, poor ventilation, and a warm room. A two-hour session in a closed space with smoke is a low-energy environment by itself.
• No food, no water, adrenaline drop. If you fasted or skipped food around it, the slump is mechanical.
• Sleep afterwards. Lying awake after an emotionally intense rite looks exactly like fatigue but is insomnia.

What actually settles it: a short note each time — date, start time, end time, what you ate, how you slept afterward. Two or three sessions will tell you which of the above it is, and it costs nothing.

If it happens on ordinary non-ritual late nights too, or it doesn't clear with a normal night's sleep, that's not a spiritual question anymore — take it to a doctor, because persistent fatigue has ordinary medical causes that deserve checking rather than explaining.

One thing that would help me give you something better: does the drained feeling show up only after rituals, or after any demanding evening?