Based on Piya Tan's analysis of the sutta Venāga,pura Sutta (A 3.63) and his quote of the traditional commentaries, we can see that it's possible to sit, walk, stand or even recline while remaining in jhana attainment, up to the fourth jhana.
For full translation of the sutta by Piya Tan, please see Venāga,pura Sutta (A 3.63). For alternative translations by ...
Good householder Frank, maybe:
First, a not yet completely great person would think:
(1) ‘This Dhamma is for one of few-desires,
not for one of many-desires.
(2) This Dhamma is for one who is content,
not for one who is dis-content.
(3) This Dhamma is for one who is reclusive,
not for one who who delights-in-social-gathering.
(4) This Dhamma is for one of ...
If we read the later part of AN 8.30, we will find that this is targeted at monks (bhikkhus) and not lay followers.
“When it was said: ‘This Dhamma is for one who is content, not for one
who is discontent,’ with reference to what was this said? Here, a
bhikkhu is content with any kind of robes, almsfood, lodgings, and
medicines and provisions ...
Ambient light perceptions are impermanent and should simply be observed:
SN22.102:1.2: “Mendicants, when the perception of impermanence is developed and cultivated it eliminates all desire for sensual pleasures, for rebirth in the realm of luminous form, and for rebirth in a future life. It eliminates all ignorance and eradicates all conceit ‘I am’
The key phrase in your question is "I sometimes doubt [...]". The "I" in this phrase is your mind entering to question your meditation practice, because that's what the thinking mind does: it looks for problems to worry about so that it can keep itself active. There are three things you can do about it, depending on your inclinations:
For starters, be aware that anapana-sati (breath meditation remembrance) as defined in the suttas is quite a different practice.
As this is a forum about Buddhism in general, it would be helpful if you designate what tradition you're practicing "anapana". Most people I would think, would assume when you say 'anapana', you're referring to sutta ...