what was jonathan harker doing when he first discovered the count in the wooden box

In one entry in Harker's diary prior to his discovery of the Count in his box, it occurs to him that he has "not yet seen the Count in daylight." This leads him to wonder whether he actually sleeps at night, and Harker decides he must seek out where the Count sleeps and try to get into his room.
In the next entry, Harker recounts how he "made the effort" and escaped back to his own room unscathed. Taking off his boots, he climbed out of his own bedroom window and in through the Count's but found the room entry. Venturing through a "heavy door" in the corner of the room, he then descended down a dark passage, out of which came "the odour of old earth newly turned." Proceeding still further into the vaults, Harker found a pile of "great boxes" on a pile of "newly dug earth." In one of these lay the Count, "either dead or asleep," with his eyes open and yet not having the appearance of death.