cum pellebam. See [on 1. 7].
somnum, 'the sleepiness.'
aditus, 'the means of approaching.' Cf. Virg. Aen. 4. 423
'Sola viri molles aditus et tempora noras.'
Note the striking picture of Catilina's abilities as a leader here given, and contrast it with Cicero's contemptuous expressions elsewhere, esp. [2. 9].
certos, 'particular,' 'definite.'
mandarat. The pluperf. indic. is rare after cum even when (as here) the connection is of time only.
quod constructed with 'obiret' as the nearest verb. 'occurreret' by itself would require dative.
vigilaret, laboraret do not grammatically construct with 'quod' at all. They are an amplification of 'obiret occurreret'; such amplification being more commonly expressed by an adverbial clause such as 'per vigilias et labores.' Cf. Aesch. P. V. 331
πάντων μετασχὼν καὶ τετολμηκὼς ἐμοί,