Thursday Morning Riddle

I’m the wood of a trunk when you cut down a tree;
To accrue flying hours for pilots-to-be;
If your sleep has gone deep, then you’re sleeping like me;
And in natural states, I’ve a base set to e.

Who am I?

UPDATE: Riddle solved by Asher. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Asher Says:

    Log

  2. Bill Says:

    LOG is correct. Way to go, Asher!

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